ftell//fopen//fseek//test ok

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fopen的使用

如果myfile.txt文件的权限是111， 文件也是可以打开的 

#include <stdio.h>int main ()
{FILE * pFile;long size;//如果myfile.txt文件的权限是111， 文件也是可以打开的pFile = fopen ("myfile.txt","rb");if (pFile==NULL) {perror ("Error opening file");}else{fseek (pFile, 0, SEEK_END);   // non-portablesize=ftell (pFile);fclose (pFile);printf ("Size of myfile.txt: %ld bytes.\n",size);}return 0;
}

userdeMacBook-Air:test userfei$ touch ftell.cpp
userdeMacBook-Air:test userfei$ vi ftell.cpp 
userdeMacBook-Air:test userfei$ g++ ftell.cpp 
userdeMacBook-Air:test userfei$ touch myfile.txt
userdeMacBook-Air:test userfei$ echo "11111111111"> myfile.txt 
userdeMacBook-Air:test userfei$ cat myfile.txt 
11111111111
userdeMacBook-Air:test userfei$ ./a.out
Size of myfile.txt: 12 bytes.
userdeMacBook-Air:test userfei$ 
 

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